As these onion halves cook, the balsamic mixture becomes syrupy and caramelizes the onions, giving them a bronzed caramel color and a luscious, rich flavor.
Ingredients
- 2 tablespoons butter, melted
- 1 tablespoon olive oil
- ⅓ cup balsamic vinegar
- 2 tablespoons dry white wine, reduced-sodium chicken broth or water
- 1 tablespoon sugar
- ¼ teaspoon salt
- ⅛ teaspoon ground black pepper
- 4 medium yellow onions (about 1 1/2 pounds total)
- 1 bunch fresh thyme leaves
Directions
- Preheat oven to 425 degrees F. Combine butter and olive oil in 3-quart rectangular baking dish. Whisk in vinegar, wine (or broth or water), sugar, salt and pepper. Set aside.
- Peel off papery outer layers of onions, but do not cut off either end. Cut onions in half from stem through root end. Place onions in dish, cut-sides up. Cover loosely with foil and bake for 30 minutes.
- Remove foil. Using tongs, carefully turn onions over to cut-sides down. Bake, uncovered, for 20 to 25 minutes longer or until onions are tender and balsamic mixture is thickened and caramelized. Serve cut-sides up. If desired, sprinkle with fresh thyme.